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microsoft/TypeScript

https://github.com/microsoft/TypeScript · scanned 2026-06-05 05:46 UTC (7 hours, 57 minutes ago) · 10 languages

2017 findings (31 legacy + 1986 scanner) 11/13 scanners ran 17th percentile · Typescript · large (100-500K LoC) Scanner says 89 (lower by 23)

File as issue Image v2 schema
UNIFIED Repobility · multi-layer engine · AI coders

Complete repo analysis

Last scanned 7 hours, 57 minutes ago · v2 · 1024 findings from 2 sources. Findings combine the legacy security pipeline AND the multi-layer engine (atlas, wiring, flows, ranked) AND verified AI agent contributions.

JSON
Combined
88.8
/100
Repobility
89
31 legacy
9-layer
89
88.9% cov · 993 gaps
Critical
0
click to filter
Agents
6
0 votes
Crowd
0
reported
Score breakdown â 2026-05-18-v5
Component Sub-score Weight Contribution
structure_score 100.0 0.15 15.00
security_score 100.0 0.25 25.00
testing_score 0.0 0.20 0.00
documentation_score 67.0 0.15 10.05
practices_score 72.0 0.15 10.80
code_quality 50.0 0.10 5.00
Overall 1.00 65.8
security_score may be inflated — optional security scanners were skipped on this fast scan
Severity distribution — click a segment to filter
Active filters: excluding tests × Reset all
Severity: Critical 0 High 9 Medium 5 Low 835 9-Layer: Software Security Quality Integrity Frontend Hardware Data Network Cicd Source: Legacy 31 9-layer 993 Crowd 0 Layer: Quality 168 Security 2 Software 56 Frontend 797 Cicd 1

Bug-class explainers. Each card groups findings of the same shape — these are the patterns most likely to ship to prod and reappear in future scans unless you systematically fix the cause, not just the instance.

Fragile runtime 21 findings
What it is: Code that runs but breaks under predictable input — division by zero, missing keys, unbounded loops, off-by-one slicing.
Why it matters: Reaches production undetected because happy-path tests pass. First user with a weird input crashes the request.
How AI causes it: AI loves writing the happy path; doesn't probe edge cases unless explicitly asked.
Fix approach: Add property-based tests. Wrap external inputs with explicit validators. Use the framework's typed deserializer (Pydantic, attrs).
12 matching findings on this repo
  • medium Parallel implementation file sits beside a canonical file src/services/_namespaces/ts.refactor.ts:1
  • medium Average file size is 659 lines (recommend <300)
  • low Duplicated implementation block across source files src/compiler/transformers/namedEvaluation.ts:147
  • low Duplicated implementation block across source files src/compiler/transformers/es2020.ts:41
  • info [MINED057] Todo Bomb: Code path with a TODO/FIXME/HACK comment that gates corre… src/services/codefixes/fixClassIncorrectlyImpleme…:45
  • info [MINED044] Js Console Log Prod: console.log left in code. Should be replaced wi… src/harness/tsserverLogger.ts:84
  • info [MINED045] Ts Non Null Assertion: x! asserts not null - bypasses null checks - … src/harness/vpathUtil.ts:29
  • info [MINED045] Ts Non Null Assertion: x! asserts not null - bypasses null checks - … src/harness/tsserverLogger.ts:59
  • info [MINED045] Ts Non Null Assertion: x! asserts not null - bypasses null checks - … src/harness/documentsUtil.ts:154
  • info [MINED054] Ts As Any: Casting to any (as any) bypasses type checking entirely. src/services/codefixes/addOptionalPropertyUndefin…:98
  • info [MINED054] Ts As Any: Casting to any (as any) bypasses type checking entirely. src/server/utilitiesPublic.ts:140
  • info [MINED054] Ts As Any: Casting to any (as any) bypasses type checking entirely. src/compiler/symbolWalker.ts:207
View all fragile runtime findings →
Legacy markers 30 findings
What it is: TODO, FIXME, XXX, HACK comments. Often indicate a known-broken path the author meant to fix.
Why it matters: Each marker is an unfinished thought. Production code shouldn't ship with debt that's documented but not tracked.
How AI causes it: AI mirrors the style of the codebase, so existing TODOs propagate into new code.
Fix approach: Convert each into a ticket. Delete the comment when the ticket lands. Use a pre-commit hook to block new TODOs without an issue link.
12 matching findings on this repo
  • low Stray `console.log` in TS/JS — tests/baselines/reference/sideEffectImports3(mod…
  • low Legacy-named symbol `NonNullableOld` in tests/cases/compiler/nonNullableAndObje…
  • low Legacy-named symbol `f0_v1` in tests/cases/compiler/genericDefaultsJs.ts:19
  • low Legacy-named symbol `TupleMapperOld` in tests/cases/compiler/inferRestArguments…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/fourslash.ts:6…
  • low Legacy-named symbol `reportsDeprecated` in tests/cases/fourslash/jsdocDeprecate…
View all legacy markers findings →
Commented-out code 92 findings
What it is: Lines of source that were intentionally disabled but never deleted.
Why it matters: Git already remembers history — commented code rots, becomes wrong, and adds noise to diffs.
How AI causes it: AI sometimes comments out broken code instead of fixing it. Reviewers approve out of inertia.
Fix approach: Delete. Trust `git log`. If you really need to remember, save it in a notes file under `docs/`.
12 matching findings on this repo
  • info Commented-code block (14 lines) in tests/cases/compiler/unionPropertyOfProtecte…
  • info Commented-code block (5 lines) in tests/cases/compiler/privacyImport.ts:26
  • info Commented-code block (5 lines) in tests/cases/compiler/mappedTypeMultiInference…
  • info Commented-code block (8 lines) in tests/cases/compiler/nodeNextPackageSelfNameW…
  • info Commented-code block (11 lines) in tests/cases/compiler/deeplyDependentLargeArr…
  • info Commented-code block (52 lines) in tests/cases/compiler/complexNarrowingWithAny…
  • info Commented-code block (9 lines) in tests/cases/compiler/es6ClassTest.ts:52
  • info Commented-code block (5 lines) in tests/cases/compiler/privacyGloImport.ts:26
  • info Commented-code block (7 lines) in tests/cases/compiler/moduleResolutionWithSyml…
  • info Commented-code block (7 lines) in tests/cases/compiler/genericTypeParameterEqui…
  • info Commented-code block (5 lines) in tests/cases/compiler/genericSignatureIdentity…
  • info Commented-code block (6 lines) in tests/cases/compiler/declarationEmitGlobalThi…
View all commented-out code findings →
Config drift 3 findings
What it is: Settings duplicated across env files, Docker compose, K8s, and code defaults, all with slightly different values.
Why it matters: Production behaviour depends on whichever copy your loader reads first. Subtle bugs in staging that don't reproduce in dev.
How AI causes it: AI writes new config from memory rather than reading the existing source.
Fix approach: Pick one source of truth (env vars + a settings module). Have every other place import from there. Lint for duplicates in CI.
3 matching findings on this repo
  • low Stray `console.log` in TS/JS — tests/cases/compiler/APISample_parseConfig.ts:31
  • low Stray `console.log` in TS/JS — tests/baselines/reference/APISample_parseConfig.…
  • info Commented-code block (13 lines) in tests/cases/fourslash/codeFixTopLevelAwait_m…
View all config drift findings →
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